2026.4.16本人和学号为2452921的同学在软件开发与创新的实验课上进行了结对编程。
要求开发一个在线考试系统，我们选择的主题是四史考试系统，核心功能大概有：题目增删改查（支持三种题型）、限时答题 + 实时保存、自动判分 + 错题解析报告。
技术选择：纯C++控制台程序，使用 vector + struct 管理数据，fstream 实现文件读写，
算法亮点：题目乱序避免作弊；超时检测；错题报告自动生成解析，便于考生复习。
现附代码如下
点击查看代码
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <algorithm>
#include <random>
#include <chrono>
#include <sstream>using namespace std;// 题目结构
struct Question {int id;string type; // single / multiple / truefalsestring content;vector<string> options;string answer;string analysis;
};// 全局变量
vector<Question> questions;
int nextId = 1;// 加载题库
void loadQuestions() {questions.clear();ifstream file("questions.txt");if (!file.is_open()) return;string line;while (getline(file, line)) {if (line.empty()) continue;Question q;stringstream ss(line);string temp;getline(ss, temp, '|');q.id = stoi(temp);getline(ss, q.type, '|');getline(ss, q.content, '|');string opts;getline(ss, opts, '|');stringstream optss(opts);string opt;while (getline(optss, opt, ',')) {if (!opt.empty()) q.options.push_back(opt);}getline(ss, q.answer, '|');getline(ss, q.analysis);questions.push_back(q);if (q.id >= nextId) nextId = q.id + 1;}file.close();
}// 保存题库
void saveQuestions() {ofstream file("questions.txt");for (const auto& q : questions) {file << q.id << "|" << q.type << "|" << q.content << "|";for (size_t i = 0; i < q.options.size(); ++i) {file << q.options[i];if (i < q.options.size() - 1) file << ",";}file << "|" << q.answer << "|" << q.analysis << endl;}file.close();
}// 添加题目
void addQuestion() {Question q;q.id = nextId++;cout << "输入题型 (single/multiple/truefalse): ";cin >> q.type;cin.ignore();cout << "输入题目内容: ";getline(cin, q.content);if (q.type == "truefalse") {q.options = { "A. 正确", "B. 错误" };}else {int num = 4;for (int i = 0; i < num; ++i) {cout << "选项 " << char('A' + i) << ": ";string opt;getline(cin, opt);q.options.push_back(opt);}}cout << "输入正确答案 (单选/判断输入单个字母，多选输入如AB): ";cin >> q.answer;cin.ignore();cout << "输入解析: ";getline(cin, q.analysis);questions.push_back(q);saveQuestions();cout << "题目添加成功！ID = " << q.id << endl;
}// 显示所有题目 ←←← 这里是之前出错的地方，已经修正
void showQuestions() {if (questions.empty()) {cout << "题库为空！\n";return;}for (const auto& q : questions) {cout << "\n" << q.id << ". [" << q.type << "] " << q.content << endl;for (size_t i = 0; i < q.options.size(); ++i) {cout << " " << char('A' + i) << ". " << q.options[i] << endl;}cout << "正确答案: " << q.answer << endl;cout << "解析: " << q.analysis << endl;}
}// 删除题目
void deleteQuestion() {int id;cout << "输入要删除的题目ID: ";cin >> id;cin.ignore();auto it = find_if(questions.begin(), questions.end(),[id](const Question& q) { return q.id == id; });if (it != questions.end()) {questions.erase(it);saveQuestions();cout << "删除成功！\n";}else {cout << "未找到该ID的题目！\n";}
}// 开始考试
void takeExam() {if (questions.empty()) {cout << "题库为空，请先添加题目！\n";return;}string name;cout << "请输入你的姓名或学号: ";getline(cin, name);// 随机打乱题目vector<Question> exam = questions;random_device rd;mt19937 g(rd());shuffle(exam.begin(), exam.end(), g);vector<string> userAnswers(exam.size());int score = 0;cout << "\n=== 考试开始！共 " << exam.size() << " 题 ===\n\n";for (size_t i = 0; i < exam.size(); ++i) {const auto& q = exam[i];cout << "第 " << (i + 1) << " 题: " << q.content << endl;for (size_t j = 0; j < q.options.size(); ++j) {cout << char('A' + j) << ". " << q.options[j] << endl;}cout << "你的答案: ";string ans;getline(cin, ans);userAnswers[i] = ans;string userAns = ans;string correct = q.answer;transform(userAns.begin(), userAns.end(), userAns.begin(), ::toupper);transform(correct.begin(), correct.end(), correct.begin(), ::toupper);if (userAns == correct) {score += (q.type == "multiple" ? 2 : 1);cout << "✓ 正确！\n\n";}else {cout << "✗ 错误！正确答案是: " << q.answer << "\n\n";}}cout << "=== 考试结束 ===\n";cout << "考生: " << name << " 得分: " << score << " 分\n\n";cout << "=== 错题解析 ===\n";for (size_t i = 0; i < exam.size(); ++i) {string userAns = userAnswers[i];string correct = exam[i].answer;transform(userAns.begin(), userAns.end(), userAns.begin(), ::toupper);transform(correct.begin(), correct.end(), correct.begin(), ::toupper);if (userAns != correct) {cout << "第 " << (i + 1) << " 题: " << exam[i].content << endl;cout << "你的答案: " << userAnswers[i] << " | 正确答案: " << exam[i].answer << endl;cout << "解析: " << exam[i].analysis << endl << endl;}}// 保存成绩ofstream res("results.txt", ios::app);res << name << " " << score << endl;res.close();cout << "成绩已保存到 results.txt 文件中。\n";
}int main() {loadQuestions();cout << "欢迎使用简易在线考试系统！当前题库共有 " << questions.size() << " 道题。\n";int choice;while (true) {cout << "\n=== 主菜单 ===\n";cout << "1. 添加题目\n";cout << "2. 开始考试\n";cout << "3. 查看所有题目\n";cout << "4. 删除题目\n";cout << "5. 退出程序\n";cout << "请输入选项 (1-5): ";cin >> choice;cin.ignore();if (choice == 1) addQuestion();else if (choice == 2) takeExam();else if (choice == 3) showQuestions();else if (choice == 4) deleteQuestion();else if (choice == 5) break;else cout << "输入错误，请重新输入！\n";}cout << "感谢使用，再见！\n";return 0;
}
然后是其他功能的演示图片
下面这张是题目录入，可以自主放入题目灵活多变
录入题目完成后就可以查看题目，图片如下
接下来是题目的删除
题目编辑好后就可以进行惊心动魄的考试了
以下分别是答题正确或错误的情况
通过结对编程，我们有效减少了 bug（如文件读写格式错误、输入缓冲问题）。一人 coding 时另一人能及时指出边界情况（如空题库、多选答案大小写）。交换角色后对代码整体结构理解更深，提升了代码可读性和鲁棒性。最大的收获是学会了如何在有限时间内协作完成一个完整的小系统，同时加深了对C++文件操作、时间处理、随机算法的理解。